JP2002142248A - Device for continuously tracing and detecting present position of yard mobile scattered in large region - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device by which, in a yard which is constructed with a material shielding or damping radio waves and is scattered in a large scaled and large regional manner, a pinpoint of a mobile and a change of continuous position information can be obtained by use of a wireless type authentication card which is relatively low-priced, compact and light-weighted, and a computer network. SOLUTION: A LAN server 4, which has received an authentication number of a wireless authentication card 7 by way of a reader/writer 6, gives a time flag to the authentication number and registers it in a storage region corresponding to the reader/writer. When a position changes by moving of a mobile, it is registered in a new storage region and unrequired registration information is deleted based on the time flag, and the results are transmitted to a main server 1. The main server 1 accepts transmission from a LAN server 4 in predetermined order, and registers it in the storage region corresponding to each LAN server. The main server 1 provides a client with a present position of the designated mobile, all mobile lists in the designated position, and a moving career of the designated mobile by a request from a client terminal 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention

[0002]

2. Description of the Related Art In order to detect or continuously track the current position of a globally dispersed mobile object, a public mobile communication system such as a GPS (Satellite Positioning System), a cellular phone, or a PHS and the like are used. Terminal is used. In addition, the identification device of the mobile unit in the premises is limited to specifying the mobile unit at a fixed point.

[0003]

SUMMARY OF THE INVENTION Currently used G
A mobile current position detection system using a public mobile communication system such as a PS, a mobile phone, or a PHS cannot be used in a structure constructed of steel, concrete, or the like that shields radio waves. In addition, there is a problem that the terminal attached to each moving body is expensive, and is large and heavy in shape.

[0004] The present invention provides a relatively inexpensive, compact, and relatively inexpensive mobile terminal that can identify a mobile object and continuously change position information in a large-scale or globally dispersed campus constructed of a material that shields or attenuates radio waves. It is intended to be obtained using a lightweight wireless authentication card and a computer network.

[0005]

In order to achieve the above object, a wireless authentication card is attached to a mobile body. further,
It has an authentication number requested by a client terminal on the computer network, that is, an antenna that directly communicates with the mobile unit, and is installed on the LAN at regular intervals in consideration of the effective data transmission distance from the wireless authentication card. In addition, a plurality of data writing / reading devices (hereinafter, referred to as reader / writers).

[0006] In the preceding paragraph, a plurality of reader / writers on the LAN are prompted to transmit an authentication number to the wireless authentication card by a predetermined procedure, and the returned authentication number is registered or deleted in its own storage device. A computer that manages a plurality of reader / writers independently (hereinafter referred to as a LAN server).

[0007] In a predetermined order, the plurality of LAN servers in the preceding paragraph are prompted to transmit the latest information in the storage device, the transmitted information is stored in its own storage device, and in response to a request from a client. It comprises a host computer (hereinafter referred to as a main server) for providing information.

[0008]

FIG. 1 is an overall configuration diagram. The wireless authentication card 7 used in the present invention has a tuning circuit,
An RF circuit such as a modulation circuit, an arithmetic unit, and a storage device are built in. The storage device has a different MAC address (so-called medium access control address) for each authentication card in advance or a separate authentication number (hereinafter referred to as two authentication numbers). ) Are registered.

A computer for managing a LAN (hereinafter referred to as LA)
N server 4), in a preset order and time interval, circulates through reader / writer 6 installed on LAN 5 and sends all wireless authentication cards in the wireless electric field area to reader / writer 6. An instruction is issued to transmit a radio wave (hereinafter referred to as a trigger) for urging the transmission of the authentication number.

The plurality of wireless authentication cards that have been triggered by the reader / writer 6 generate random numbers in the built-in arithmetic devices according to the CSMA / CA protocol, acquire the transmission order of the authentication numbers, and sequentially obtain the transmission order of the authentication numbers. Send authentication numbers according to the order. At this time, if the transmission times overlap, a trigger is transmitted again and the same operation is repeated.

The LAN server 4 which has received the authentication number via the reader / writer 6 returns a MAC address previously assigned to the reader / writer 6 to the authentication number and a time mark indicating the moment when the authentication number is recognized (hereinafter referred to as a time flag). Is added to the storage device based on any standard time running in the computer.

When the reader / writer is arranged on a straight line as shown in FIG.
From reader / writer 6 via (2) of reader / writer 6
(3), the LAN server 4 recognizes the authentication number of the mobile unit 7 via the reader / writer 6 (3) when the LAN server 4 recognizes the authentication number of the mobile unit 7. The authentication number and the attached information are deleted from the storage area corresponding to 1) based on the time flag, and at the same time, the new registration and the deleted information are transferred to the host computer (hereinafter referred to as the main server 1) which integrally manages the LAN server 4. To send via. That is, the same authentication number can be simultaneously registered only in the storage areas corresponding to the two reader / writers. The moving body is again the original reader / writer 1
Similarly, the old registration is also deleted based on the time flag when returning to the wireless electric field region.

When the reader / writer is installed in a continuous triangle on a two-dimensional plane as shown in FIG. 3, a new reader / writer 6 which is third in time from the first reader / writer (1) is used. When the data is registered in the storage area corresponding to (4), the same processing as described in paragraph 0012 is performed. That is, the same MAC address can be registered in only three storage areas at the same time.

When the reader / writer is installed in a continuous triangular pyramid in a three-dimensional space as shown in FIG. 4, it corresponds to the fourth new reader / writer including the reader / writer corresponding to the height. When it is registered in the storage area
The same processing as described in 012 is performed. That is, the same MAC address can be registered in only four storage areas at the same time.

[0015] The main server 1 receives L in a predetermined order.
The transmission of the authentication number, the MAC address of the reader / writer, and the time flag from the AN server 4 is accepted, and additional registration is performed in the storage device while associating them with each other.

When the update information transmission from the LAN server 4 to the main server 1 is delayed, the update information is stored in the temporary storage area and deleted after the transmission is completed.

When an arbitrary authentication number is input from the client terminal 2, the main server 1 converts the authentication number into a MAC address according to a predetermined rule, and based on the time flag, updates the latest authentication number, that is, the current position,
That is, if the MAC address of the reader / writer is converted into an n-ary number which is easy for the client to understand, or a code converted into a general name according to a predetermined rule and a time flag indicating the arrival time, two at the same time if the contents described in paragraph 0012 are used , 3 at the same time according to the description in paragraph 0013.
In the case of the description in paragraph 0014, four data are provided at the same time. Also, if there is a request to provide travel history,
Based on the time flag, the previous data is provided in the order of the time flag.

When the main server 1 receives, from the client terminal 2, the MAC address of an arbitrary reader / writer 6, a numerical value converted into an n-ary number which is easily understood by humans, or a code converted into a general name according to a predetermined rule. Provides the authentication numbers of all the mobile units existing in the electric field area of the reader / writer, arranged in the order of the time flag.

The movement history of the authentication number is stored in the client terminal 2.
Any storage period can be set from the side.

[0019]

Since the present invention is configured as described above, it has the following effects.

It is possible to know the current position of an arbitrary moving object in a campus that is dispersed globally.

[0021] It is possible to know all the moving objects in an arbitrary area in the premises which are dispersed globally.

[0022] It is possible to know the movement history of an arbitrary moving object in the premises which are dispersed globally.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of the present apparatus.

FIG. 2 is a diagram showing a positional relationship between a reader / writer and a wireless authentication card, that is, a moving body, which are installed on a straight line.

FIG. 3 is a diagram showing a positional relationship between a reader / writer and a wireless authentication card, that is, a moving body, which are installed in a plane.

FIG. 4 is a diagram illustrating a positional relationship between a reader / writer installed in a three-dimensional space and a wireless authentication card, that is, a moving body.

FIG. 5 is an overall processing flowchart.

Claims (3)

[Claims] 1. A current location of a specified mobile unit, a list of all mobile units existing at the specified location, and a movement of the specified mobile unit in each premises distributed globally by a wireless authentication card and a computer network. A device that provides a history to a client terminal on a computer network. 2. A device according to claim 1, wherein a time flag indicating an arrival time is added to the storage device of the computer when newly registering the position information of the moving object, and the position becomes unnecessary by the movement. The time flag is also used when deleting information from the storage device. 3. The apparatus according to claim 1, wherein a lower-level computer directly corresponding to the mobile unit via the reader / writer autonomously collects and updates the position information of the mobile unit by a predetermined procedure. The upper computer directly corresponding to the client receives the position information from the lower computer in a predetermined order, thereby reducing the load on the computer network.